Fix `w3cid` value for Denken

[msporny]

I had to fill in a placeholder value for Denken's w3cid value here:

vc-confidence-method/index.html

Line 24 in c5d5c78

w3cid: 100000

@denkeni, can you go here and use the number that shows up in your profile page URL (in the address bar): https://www.w3.org/users/myprofile/

[denkeni]

I need confirmation from our AC representative regarding the affiliation. Please allow some time, and apologies for the inconvenience.